Category Archive CNC Technology

Fixture is an essential part of CNC machining center. Each CNC machining center will use fixture. According to the different products processed, the fixture used is different, and the requirements for fixture are different. However, CNC machining center has similar requirements for fixture, and special workpiece has different requirements for fixture. So what are the requirements of CNC machining center for fixture? Let’s have a brief understanding:

1. High precision fixture

As we all know, CNC machining center has a very high precision, which is usually used to process parts or molds with high precision. For this reason, CNC machining center also puts forward the requirements of fixture high-precision positioning and installation, as well as the requirements of transposition and positioning accuracy.

1. The fixture should be convenient and fast when clamping the workpiece

In order to meet the high-speed machining fixture of CNC machining center, hydraulic and pneumatic fast locking power is adopted, especially for the workpiece locking with long processing time. The general hydraulic clamping system will be attached with a storage device, which can supplement the internal leakage and prevent the workpiece from loosening on the fixture.

1. The fixture should be open

CNC machining center is processed by the tool contacting the workpiece. Under the clamping of the workpiece, the workpiece should provide relatively spacious operation space for the fast moving tool and tool changing quick action. Especially for the complex workpiece with multiple tool changes, the fixture structure should be as simple, convenient, fast and open as possible to make the tool easy to enter and exit, and prevent the tool from colliding with the fixture workpiece in the process of processing.

1. The fixture should have high adaptability

We all know that CNC machining center is flexible and multi deformation, so the fixture should have high efficiency adaptability to different workpiece and different clamping.

The above is the CNC machining center on the clamp requirements, I hope to help you.

In the process of work, it is very normal to have trouble, so we should not be too surprised when we encounter a fault. If we want to avoid more failures, we should do a good job of maintenance outside of work. Many new users do not know what to do when they encounter a fault. If you want to solve the problem, you should first find the source of the problem Let’s find out what causes CNC processing?

1. Maybe it’s the tool. Sometimes it’s not our operation that’s wrong, it’s the accessories. Because the tool is not sharp enough and the strength is not enough, all these reasons will lead to the tool breaking.
2. It can also be due to material problems, when the aluminum alloy shell is not uniform, uneven soft and hard, or too many impurities can lead to problems.
3. For clamping, we need to see whether the aluminum alloy shell is clamped firmly and whether the clamp is locked. These reasons are worthy of our attention.
4. There is also the problem of machine tools. CNC machining machine tool level; whether the voltage is stable; whether the machine lead screw aging and other reasons
5. The problem of the program is: when writing the aluminum alloy shell processing program, whether the spindle motor speed is too low; whether the cutting amount is too large; whether the machining allowance is reasonable; whether the aluminum chip discharge is smooth.

The above problems are the causes of tool breakage in NC machining. To solve the problem, we must first find out what causes it, so that we can better solve the problem. Today’s editor will talk about it first. If you want to know more information, please visit our website

What are the programming skills of CNC machining? Let’s have a simple understanding:

1、 Using computer to imitate simulation system

With the development of computer technology and the continuous amplification of NC machining education, there are more and more NC machining simulation systems, and their performance is improving day by day. Therefore, it can be used to start the inspection procedure and watch the tool’s activity to determine if there is a possibility of collision.

2、 Using the imitation performance of CNC machining center

Generally, more advanced CNC machining centers have graphic display performance. After inputting the program, we can call the graph to simulate the performance and watch the moving track of the tool in detail, so as to check whether the tool may collide with the workpiece or fixture.

3、 The idling performance of CNC machining center

The accuracy of tool path can be tested by using the idling performance of CNC machining center. When the program is input into the CNC machining center, you may as well install the tool or workpiece, and then press the “idle” button. At this time, the spindle does not rotate, and the worktable automatically runs according to the program path. At this time, you may find out whether the tool may collide with the workpiece or fixture. However, in this case, it must be ensured that when the workpiece is installed, the cutter cannot be installed; when the cutter is installed, the workpiece cannot be loaded, otherwise there will be collision.

4、 Using the locking performance of CNC machining center

Generally, CNC machining centers have locking performance (full lock or single axis lock). After inputting the program, the z-axis is locked and the collision can be inferred by the coordinate value of z-axis. The use of this feature should avoid tool change, or the program can not pass.

5、 The configuration of coordinate system and cutter compensation must be accurate

When starting CNC machining center, the reference point of CNC machining center must be configured. The working coordinate system of CNC machining center should be consistent with that of programming, and it is more and more the target of Z axis. If there is a mistake, the possibility of collision between milling cutter and workpiece is quite large. In addition, the configuration of tool length compensation must be accurate, otherwise, it is either empty machining or collision.

The above is the CNC processing programming skills, I hope to help you.

CNC lathe processing need to pay attention to which points? We have a simple understanding of the following:

1. Pay attention to the selection of cutting parameters

The cutting speed, feed rate and cutting depth of CNC Lathe will directly lead to tool damage. With the increase of cutting speed, the tool tip temperature will rise, which will cause mechanical, chemical and physical related wear. When the cutting speed is increased by 20%, the tool life will be reduced by 1 / 2. The influence of feed rate on tool wear is smaller than that of cutting speed, but when the feed rate is large and the cutting temperature rises, the tool wear will be greater. Although the influence of cutting depth on the tool is not as great as the cutting speed and feed rate, when the cutting depth is small, the hard layer of the material to be cut will also affect the tool life.

1. Pay attention to the tool selection

1) In rough turning, the tool with high strength and good durability should be selected to meet the requirements of large back cutting and large feed rate. CNC programming UG communication Q group: 304214709, want to learn NC programming, get no taste of learning raw materials plus this group Oh

2) When finishing turning, the tool with high precision and good durability should be selected to ensure the machining accuracy.

3) In order to reduce the time of tool change and simple tool setting, machine clamping tool and machine clamping blade should be selected.

CNC machining

1. Pay attention to the selection of fixture

1) Although the general fixture is used to clamp the workpiece, the special fixture is prevented;

2) Parts positioning datum coincide to reduce positioning deviation.

1. Pay attention to the affirmation of processing route

Machining route refers to the moving track and target of tool relative to parts in the process of NC lathe machining.

1) The machining accuracy and surface roughness requirements shall be guaranteed;

2) The processing route should be reduced to reduce the tool idle travel time.

In the process of NC lathe processing, we should pay attention to the above four points for attention. Only by choosing the most suitable NC lathe processing mode can we improve the processing efficiency and accuracy of NC lathe processing.

The above is CNC lathe processing need to pay attention to a few points, I hope to help you.

What aspects need to be monitored during CNC processing? Let’s have a brief understanding:

1. Monitoring of rough machining

Machining process monitoring and rough machining focuses on the rapid removal of surplus on the workpiece surface. In the process of automatic machining, according to the set cutting parameters, the tool automatically cuts according to the predetermined cutting path. At this time, the operator should pay attention to the change of cutting load in the automatic machining process through the cutting load table, adjust the cutting parameters according to the receiving force of the cutting tool, and develop the maximum efficiency of the machine tool.

1. Monitoring of cutting sound

Monitoring of cutting sound in the process of automatic cutting, the sound of cutting tool cutting workpiece is stable, continuous and light, and the activity of the machine tool is stable. With the cutting process going on, when there are hard points on the workpiece or tool wear or tool clamping, the cutting process will be unstable. The instability is that the cutting sound changes, and the tool and workpiece will collide with each other, causing a sensation in the machine tool. At this time, the cutting parameters and cutting conditions should be adjusted quickly. When the adjustment effect is not obvious, the machine tool should be suspended to check the cutting tool and workpiece.

1. Monitoring of finish machining

Finish machining process monitoring finishing, mainly to ensure the machining size and surface quality of the workpiece, high cutting speed and large feed rate. At this time, attention should be paid to the effect of chip accretion on the machined surface. For cavity machining, we should also pay attention to the over cutting and tool passing at the corner. In dealing with the above problems, the first is to adjust the spray position of cutting fluid to keep the machined surface in cooling condition at all times; the second is to pay attention to the quality of the machined surface of the workpiece. After adjusting the cutting amount, the quality change can be prevented as much as possible. If the adjustment still has no obvious effect, it should stop to check whether the original procedure is correct. Special attention should be paid to the tool position when the inspection is suspended or stopped. If the tool stops in the process of cutting, the spindle suddenly stops rotating, which will cause tool marks on the surface of the workpiece. In general, the shutdown should be studied when the tool is out of the cutting form.

1. Tool monitoring

The quality of the tool is very high, which determines the machining quality of the workpiece. In the process of automatic machining and cutting, the normal wear and abnormal damage of cutting tools should be inferred by means of sound monitoring, cutting time control, suspension inspection during cutting and workpiece surface analysis. According to the processing requirements, the cutting tools should be treated quickly to prevent the processing quality problems caused by the cutting tools not being handled in a hurry.

The above is CNC processing need to monitor several aspects, hope to help you.

Any equipment and machinery in the production process will have some fault problems, so our CNC processing is the same, but generally lead to the failure of the main shaft, so we can first find the problem from the spindle, the spindle system according to the transmission system can be divided into variable speed gear main drive spindle, through the belt drive main transmission spindle The main shaft is driven by two motors and the main shaft is integrated by motor and spindle. So, let’s learn about the common faults of CNC machining?

1. Overload.

Fault causes: excessive cutting amount, frequent positive and negative rotation, spindle motor failure, spindle drive device failure.

1. The spindle does not rotate

Fault causes: spindle drive device failure, CNC device can not output speed signal, spindle motor fault, spindle drive device fault, drive belt fracture.

1. Spindle speed deviation from command value

Fault causes: motor overload, problems with spindle speed command output from CNC system, fault of speed measuring device or disconnection of speed feedback signal.

1. Abnormal noise and vibration of spindle

Fault cause: it usually occurs in the process of deceleration, and the spindle drive device has problems, such as the regeneration circuit fault in AC drive.

The above points are the common faults of CNC machining spindle, and the above editor also talked about the solution. Today, I will talk about it here. If you want to know more information, please visit our website for detailed consultation.

What are the principles of CNC machining error of mechanical parts? Let’s have a brief understanding:

1. Processing deviation

The reason deviation of CNC machining is due to the selection of the approximate machining activity method or the similar tool appearance. Because of the deviation in the machining principle, it is called the machining principle deviation. The reason deviation should be within the promise line.

1. Geometric deviation of machine tool

The manufacturing deviation, installation deviation and wear in use of machine tools directly affect the machining accuracy of the workpiece. Among them, it is mainly the spindle rotation, the linear movement of the guide rail and the deviation of the transmission chain of the machine tool.

1. Manufacturing deviation and wear of cutting tools

CNC machining tool manufacturing deviation, installation deviation and wear in use, all affect the machining accuracy of the workpiece. In the process of cutting, the cutting edge, cutting face, workpiece and chip have a sharp conflict, which makes the tool wear. When the tool wear reaches a certain value, the surface roughness of the workpiece increases, and the chip color and form change, and appear to be vibration. Tool wear will directly affect the cutting rate, machining quality and cost.

The above is the principle of CNC machining error of mechanical parts, hope to help you.

We usually know that when we buy clothes, the most important thing is good-looking, followed by quality. Because only attract our eyes, so that customers have the desire to see. It is the same in our industrial industry, but we should pay attention to the quality, because our industry pays attention to the practical aspect. So let’s find out what factors should be considered when choosing the CNC surface processing method?

1. Any CNC machining method can obtain a considerable range of machining accuracy and surface roughness, but only in a narrow range is economic, the range of machining accuracy is economic. Therefore, when selecting the processing method, we should choose the corresponding processing method which can obtain the economic machining accuracy.
2. The material properties of CNC parts should be considered.
3. The structure shape and size of CNC parts should be considered.
4. Productivity and economic requirements should be considered. In mass production, advanced technology with high efficiency should be adopted. Even can fundamentally change the manufacturing method of the blank, can reduce the amount of mechanical processing labor.
5. The existing equipment and technical conditions of the factory or workshop should be considered. When selecting the processing method, the existing equipment should be fully utilized, the potential of the enterprise should be tapped, and the enthusiasm and creativity of the workers should be brought into play. However, it is also necessary to continuously improve the existing processing methods and equipment, adopt new technologies and improve the technological level.

The above points are the factors that we can’t ignore when we choose the CNC surface processing method. We must pay attention to them. Today, we will talk about it first. If you want to know more information, please visit our website for details

What are the causes and solutions of CNC machining accuracy

1. The workpiece size is accurate and the surface brightness is poor

Obstacles: the tool tip is damaged and not sharp; the machine tool resonates and is instable; the machine tool crawls; and the processing technology is not good.

Treatment plan: if the tool is not sharp after being worn or damaged, it is necessary to grind the tool from the beginning or select a better tool to set it from the beginning; if the machine tool resonates or is instable, adjust the level and lay the basic, unchanged and stable; Due to the creeping of the machine, due to the wear of the carriage guide rail and the wear or looseness of the lead screw ball, the machine tool should pay attention to the maintenance, clean the iron wire after going to work, and quickly add smooth oil to reduce the conflict; select the appropriate cooling liquid for workpiece processing, even if it can meet the processing requirements of other processes, select a higher spindle speed.

1. The taper of workpiece is large and small

Obstacles: the level of the machine tool is not adjusted well, one high and one low, resulting in instable placement; when turning the long shaft, the raw material of merit is hard, and the cutting tool is deep, forming the phenomenon of giving way to the cutter; the difference between the tailstock thimble and the spindle.

Treatment plan: adjust the levelness of the machine tool with a level gauge, lay a solid foundation, keep the machine tool unchanged and increase its toughness; select the correct process and appropriate cutting feed rate to prevent the tool from being forced to yield to the cutter; adjust the tailstock.

1. The driver phase light is normal, but the size of the workpiece processed is large or small

Obstacles: long term high-speed operation of the machine tool carriage results in the wear of the screw rod and bearing; the repeated positioning accuracy of the tool carrier has errors in long-term use; the carriage can accurately return to the starting point of processing each time, but the processing workpiece size still changes. This phenomenon is usually formed by the spindle, the high-speed rotation of the spindle makes the bearing wear very important, forming the processing size change.

Processing plan: use the dial indicator to lean against the bottom of the tool rest, and compile a constant cycle program through the system to check the repeated positioning accuracy of the carriage, adjust the screw rod clearance, and replace the bearing; use the dial indicator to check the repeated positioning accuracy of the tool rest, adjust the machinery or replace the tool carrier; Use the dial indicator to check whether the workpiece is returned to the starting point of the program accurately. If it is possible, check the spindle and replace the bearing.

1. The difference between the size of the workpiece and the essential size is several millimeters, or there is a great change in a certain axial direction

Obstacles: the speed of rapid positioning is too fast, and the drive and motor can not respond; after long-term conflict and consumption, the mechanical drag screw rod and bearing are too tight and stuck; the tool carrier is too loose and can not be locked tightly; the compiled program error, the head and tail are not taken care of or the cutter compensation is not canceled; the electronic gear ratio or step angle configuration of the system is wrong.

Treatment plan: if the positioning speed is too fast, the go speed should be adjusted appropriately, and the driver and motor can work normally under the rated operating frequency by cutting with slowing down and time; if the drag plate and screw rod crane bearing are too tight and stuck after the machine tool is worn, it must be adjusted from the beginning; If the tool holder is too loose after tool change, it is necessary to check whether the tool holder reversing time is satisfied, whether the worm gear inside the tool holder is worn, whether the clearance is too large, whether the installation is too loose, etc.; if it is caused by the program, it is necessary to correct the program, comply with the requirements of the workpiece drawing, select the correct processing technology, and write the accurate program according to the instructions in the footnotes; If it is found that the size error is too large, the test system parameters are correctly configured, the unique is whether the parameters such as electronic gear and step angle are damaged, which can be measured by dial indicator.

1. The effect of arc processing is not dream, and the size is not in place

Obstacle causes: resonance caused by repeated vibration frequency; processing technology; parameter configuration bifurcation, too large feed speed, resulting in out of step in arc machining; loose or tight lead screw caused by large gap; wear of synchronous belt.

Treatment plan: find out the parts with resonance, change its frequency and prevent resonance; study the processing technology of workpiece raw materials and correctly program; as for stepping motor, the processing speed f cannot be too large; whether the machine tool is installed stably and stably, whether the carriage is too tight after wearing, the gap is increased or the tool holder is loose; replace the synchronous belt.

The above is the cause of poor CNC machining accuracy and solutions, hope to help you

In the process of processing, there must be some factors that affect our work efficiency, of course, it will also affect our work effect. When these problems occur, we must deal with them in time to avoid more failures in the future. We must deal with them in time. There are many factors affecting the processing effect. Let’s learn about the influence of CNC plus What are the labor factors?

1. Before processing, it is necessary to determine the processing technology, make clear the content of the process card, especially to determine the shape of the parts to be processed, and know the content of the next processing program.
2. The blank size should be measured before clamping, and the blank placement must be carefully checked to see if it is consistent with the programming.
3. After the rough machining of the blank is completed, maintenance should be carried out to determine whether the workpiece is correctly divided? Is the workpiece dislocated and loose? Is the dimension from the processing part to the reference point meet the drawing requirements? After checking, the shape and scale of rough machining should be measured timely and accurately.
4. Semi finish machining or finish machining can only be carried out after the rough machining and maintenance is completed. After finishing the processing, the technician shall check the shape and size of the processing parts, mainly check the vertical and inclined plane processing parts and the base point size marked on the measurement drawing for approval.
5. After the completion of manual maintenance, it can be removed only after confirming that the drawing process meets the relevant requirements, and the workpiece is sent to the quality inspector for special inspection